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Fiber-coupled dual-mode waveguide interferometer with lambda/130 fringe spacing.

Richard M Jenkins1, Andrew F Blockley, J Banerji

  • 1Optical Research and Consulting Business Group, QinetiQ, Malvern, Worcs WR14 3PS, United Kingdom. rmjenkins@qinetiq.com

Physical Review Letters
|June 4, 2008
PubMed
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Researchers demonstrated a novel dual-mode waveguide interferometer. A small 10.0 nm change in waveguide width achieved a complete beam switching cycle, significantly improving fringe spacing for optical applications.

Area of Science:

  • Optics and Photonics
  • Waveguide Technology
  • Interferometry

Background:

  • Multimode waveguide interferometers are crucial for optical sensing and signal processing.
  • Achieving high sensitivity and fine control over output beams is a key challenge.

Purpose of the Study:

  • To report predictions and measurements of a fiber-coupled, dual-mode waveguide interferometer.
  • To demonstrate enhanced performance in terms of switching cycle and fringe spacing.

Main Methods:

  • Operating a hollow planar mirror waveguide in a dual-mode regime.
  • Utilizing a 1.32 microm light source.
  • Precisely controlling the waveguide width (8.0 microm) to induce beam switching.

Main Results:

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  • A complete switching cycle of the output beam was achieved with a 10.0 nm incremental change in waveguide width.
  • The resulting fringe spacing was approximately lambda/130.
  • This represents an order of magnitude improvement over previously reported results.

Conclusions:

  • The demonstrated dual-mode waveguide interferometer offers significantly enhanced performance.
  • This advancement has potential implications for high-resolution optical devices and sensors.